<template>
    <div :style="{ padding: '0 0 32px 32px' }">
        <h4 :style="{ marginBottom: '20px' }">{{ title }}</h4>
        <v-chart :force-fit="true"  :height="height" :data="data" :scale="scale" :onClick="handleClick" >
            <v-tooltip/>
            <v-axis  />
            <v-legend/>
            <v-line position="type*y" color="x"/>
            <v-point position="type*y" color="x" :size="4" :v-style="style" :shape="'circle'"/>
        </v-chart>
    </div>
</template>

<script>
  import { DataSet } from '@antv/data-set'
  import { ChartEventMixins } from './mixins/ChartMixins'

  export default {
    name: 'LineChartMultid',
    mixins: [ChartEventMixins],
    props: {
      title: {
        type: String,
        default: ''
      },
      dataSource: {
        type: Array,
        default: () => [
          { type: 'Jan', jeecg: 7.0, value: 3.9 },
          { type: 'Feb', jeecg: 6.9, value: 4.2 },
          { type: 'Mar', jeecg: 9.5, value: 5.7 },
          { type: 'Apr', jeecg: 14.5, value: 8.5 },
          { type: 'May', jeecg: 18.4, value: 11.9 },
          { type: 'Jun', jeecg: 21.5, value: 15.2 },
          { type: 'Jul', jeecg: 25.2, value: 17.0 },
          { type: 'Aug', jeecg: 26.5, value: 16.6 },
          { type: 'Sep', jeecg: 23.3, value: 14.2 },
          { type: 'Oct', jeecg: 18.3, value: 10.3 },
          { type: 'Nov', jeecg: 13.9, value: 6.6 },
          { type: 'Dec', jeecg: 9.6, value: 4.8 }
        ]
      },
      fields: {
        type: Array,
        default: () => ['jeecg', 'value']
      },
      // 别名，需要的格式：[{field:'name',alias:'姓名'}, {field:'sex',alias:'性别'}]
      aliases: {
        type: Array,
        default: () => []
      },
      height: {
        type: Number,
        default: 254
      },

    },
    data() {
      return {
        scale: [{
          type: 'cat',
          dataKey: 'x',
          min: 0,
          max: 1,
        }],
        style: { stroke: '#fff', lineWidth: 1 },
        vchartsConfig:{
          xAxis: {
            axisLabel:{
              color:'#3a3a3a',
            }
          }
        }

      }
    },
    computed: {
      data() {
        const dv = new DataSet.View().source(this.dataSource);
        dv.transform({
          type: 'fold',
          fields: this.fields,
          key: 'x',
          value: 'y',
        })
        let rows = dv.rows;
        // 替换别名
        rows.forEach(row => {
          for (let item of this.aliases) {
            if (item.field === row.x) {
              row.x = item.alias;
              break
            }
          }
        })
        return rows
      }
    }
  }
</script>

<style scoped>

</style>
